Okay, this one isn’t great, but given all I had access to in game, this is what I settled with for Twilight.
Using the Dewbauchee Specter Custom (an in-universe Aston Martin DB10, Aston Martin Vantage GT8), I then settled on this livery, with as close as a colour scheme as I could get to her.
She’s at least as fully modified as I can get her in game, so she’s certainly not sluggish.